Abstract:

 According to the gold concentrate of a cyanide plant，in order to further enhance the rate of cyanide leaching，the minitype，semi-industrial and industrial experimental study were conducted under atmospheric oxygen enriched leaching technology in this study.The results of minitype test showed that the rich oxygen leaching process can increase the leaching rate by 0.3%，and the semi-industrial test displayed that the gold leaching rate was obviously higher than that obtained by the air leaching.In addition，industrial test results during three months demonstrated that the oxygen rich leaching can improve the leaching speed compared to the technique of air leaching，and significantly increase the leaching rate by 0.18%.With the oxygen rich leaching，the silver grade in leach residues can be even low to 5×10-6~6×10-6，and it increased economic benefits by 4.9 million yuan per year.Hence，the research results in the present work provide reference for application in the gold enterprises，and will promote the development of the cyanide leaching technology in the future.

Key words: atmospheric oxygen enriched, cyanide, leaching rate